CA1088911A - Gas valve seating member - Google Patents
Gas valve seating memberInfo
- Publication number
- CA1088911A CA1088911A CA307,807A CA307807A CA1088911A CA 1088911 A CA1088911 A CA 1088911A CA 307807 A CA307807 A CA 307807A CA 1088911 A CA1088911 A CA 1088911A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- valve member
- seating surface
- lip
- raised portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
- F23N5/107—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using mechanical means, e.g. safety valves
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lift Valve (AREA)
- Magnetically Actuated Valves (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A gas valve has a valve seating surface and flexible valve member to insure that the gas flow is terminated when the valve closes. The valve seating surface has a flat portion around an opening and a raised portion around the peripheral opening. A cooperating flexible valve member has a flat portion and a raised portion around its periphery. When the flexible valve member moves against the seating surface, the raised portion of the flexible valve member engages the flat portion of the seating surface and the raised portion of the seating surface engages the flat portion of the valve member to form two concentric series con-nected seals to insure that gas flow through the valve is terminated.
A gas valve has a valve seating surface and flexible valve member to insure that the gas flow is terminated when the valve closes. The valve seating surface has a flat portion around an opening and a raised portion around the peripheral opening. A cooperating flexible valve member has a flat portion and a raised portion around its periphery. When the flexible valve member moves against the seating surface, the raised portion of the flexible valve member engages the flat portion of the seating surface and the raised portion of the seating surface engages the flat portion of the valve member to form two concentric series con-nected seals to insure that gas flow through the valve is terminated.
Description
8891~
AN IMPROVED GAS VALV~ SEATING MEMBER
~ACKGROUND AND'SUMMARY 0:~ THE INVENTION
While the design of gas valves has always had the concern of disastrous condi.tions ta:king place iE leakage occurs, with the advent of extreme product liability and a greater .
concern for personal sa~ety, there ;`s a continuous endeavour to make gas valves so that when the safety portion of the gas valve closes, gas flo~ is absolutely terminated. As gas valves of this type generally set fox a number of years in an open a posi,tion, especiall~ if the pilot burner is maintained on throughout the summer, a design for a gas valve to insure that there is an ade~uate seal should the safet~ valve close at any ', time ~s a necessity.
The present invention is concerned w.ith a dual sealing ::~
surface valve to insure adequate termination of gas flow without the expense of two series connected ~as Yalves fox redundant .
safety. $peci~ically, the valYe seatiny surface and the valve member engage to ~o~m two concentric seali,ng rin~s or surfaces ~y having a-valve.s:eating surface that has a flat portion and a raised portion concentric of the'opening and a flexible valve member which'h.~s a flat surface and a raised portion on its outer " , periph.ery. ~hen the ~lexi,ble valve me~ber engages the seating surface~ th.e'raised portiPns engage the' xespectiVe flat portions to form the't~ concentric series sealing surfaces to prevent gas flo~ t~roug~`the passage~a~.
In accordance ~ith one aspect of the present invention there is provided a gas valve comprising: a valve body having a passageway through.which, gas is adapted to flow from a source of gas under pressure to a gas burning apparatus; valve means 30. in said pas5ageway comprising: a valve'seating surface having .~ - ~
~ 1- 7~
.
:. ~ . - , . :
10~89~
a flat portion and a raised portion surrounding an opening, and a valve member attached to a shaft for movement against said first seating surface to close the valve, having a second seating surface having a flat portion and a raised portion surrounding said shaft, so that upon said valve member engaging said seating sur~ace, the respective raised portions engage the respective flat portions to form two concentric series seals to prevent gas flow-through said passageway.
In accordance ~ith another aspect of the invention there is provided a gas valve having a valve means in a passageway between an inlet and an outlet comprising: a valve seating surface surrounding an opening in said passageway, said surface having a flat surface around said opening and a concentric raised portion around said surface; a valve member cooperating with said seating surface, said valve member having a flat flange extending outward around the periphery of said valve member, sa~d valve member hawing a ra~.sed portion adjacent sai.d flange intermediate its center and said flange whereby . .
upon s~id valve ~ember engaging said ~alve seating surface; :
2Q said raised portion of s.aid valve member engages said flat surface and said raised portion of sa~.d seati.ng surface engages said flange. to ~orm t~o concentric seals. to stop gas flow through said opening.
In accordance ~ith yet another aspect of the invention there is provided a gas valve. comprising~ a valve body having an i.nlet opening adapted to be connected to a source of gas under pressure, an outlet opening adapted to be connected to a gas burn~ng apparatus, and a passage~ay through the body interconnecting said inlet opening and said outlet 3a opening; a valve seati.ng surface around an opening forming said ~3 89~1 passageway between said inlet opening and said outlet opening, said valve seating surface having a ~lat portion around a periphery o~ said opening with a first lip in close proximity to said flat portion, said lip surrounding said opening and projecting in a first direction parallel to a center of said opening; and a flexible valve member attach.ed to a shaft for movement of said valve member, said valve member having a second lip around its periphery, said second li.p o~ said valve member projecting oppoa~te said first direction; fiaid valve member '' having a flat surface intermediate said second lip and said ', shaft wherehy upon said val~e member engaging said valve seating surface, said first lip of said valve seating surface engages :
said flat surface of sa~d ~alve member and said second lip of said valve. member engages s-aid valve seati.ng surface adjacent its projecting lip ~hen clo~ing,so that two series gas flow aeals are prov~,ded ~hen said va].ve member is moved against said valve seating surface~
The èmbodiments of the invention are shown in the -' drawings as:
2Q Figure 1 i.s a cross sectional view of a valve with the '~ ,, seating surface and valve member in a clos~d position, Figure 2 is a vertical view-of the aeat and valve member, Figure 3 is a side cross sectional view of the valve, -lb-.
10889~
Figure 4 is a second embodiment of the valve.
DESCRIPTIO~ OF T~IE I~VE~TIO~
Referring to Figure 1, a gas valve has a body 10 having an inlet opening 11 for connecting the gas valve to a source of gas under pressure and an outlet opening 12 for connecting the gas valve to a gas burning apparatus such as a furnace. The gas valve has a safety valve 13 and an automatic control portion 14.
The automatic control portion has a valve member 15 controlled by a flexible diaphragm 16 to maintain an adequate flow of gas from the outlet by a pressure regulator or awtomatic control means (not shown) such as disclosed in the Paul Dietiker et al U.S.
patent 3,354,901 issued November 28, 1967. When the sa~ety valve 13 is open, gas flows through a manually operated plug valve 17, a solenoid operated valve 18, the automatic control valve 15 to the outlet. Plug valve 17 is operated by turning a knob 19.
Safety valve 13 has an electromagnet 20 which is con-nected at 21 to a thermocouple. Upon energization of the electro-magnet by heating the thermocouple, an armature attached to shaft 22 and moved against a magnet by the downward manual operation of reset button or knob 19, holds the sa~ety valve in an open position to allow gas flow through the passageway. Such a ther-mocouple operated safety valve is quite conventional and is dis~
closed in the Paul Dietiker U.S. patent 3,877,475 issued April 15, 1975.
As also shown in Figures 2 and 3, safety valve 13 has a valve seating surface 30 which surrounds an opening 31 in the passageway between the inlet and outlet. The seating surface 30 has a flat portion 32 around the opening and a concentric raised portion or lip 33 in close proximity to the flat portion 32 around the periphery of the opening.
108B9~l A valve member 34 which is attached in a conventional mar~er to shaft 22/ cooperates with seating surface 30. valve member 34 has a flexible portion or member 35 made of rubber or suitable flexible material which has a concentric flat portion 40 and a concentric raised portion or lip gl about its periph~ry_ The flexible me~ber or rubber disc 35 is held on shaft 22 and bac'~ed by ~ember ~3. A space 44 is provided between the meta~
disc 43 and the flexible valve m~mber 40 by an indent or groove 45 in the valve member 35 to allow for adjustment of the positiQ~
of the flat portion of the valve member 40 when engaging raisea portion 33 o~ the seating surface to insure a seal all aroun~
raised pox~ion 33.
When valve member 34 moves upward by the force o~ a compression spring 36 to close the safety valve 13 upon k~
-15 de-energization of electromagnet 20, the raised portion 41 engages the surface 32 and the raised portion 33 engages the flexible surface 40 which will bend to accomodate for variations in the tolerance and irregularities or the possibility of foreign par-ticles existing on thP sealing surfaces. With the closure o~
the valve member 34, two concentric rings of sealing sur~ace are providea to provide a two series sealing of the safe~y val~e 13.
Another embodiment of the valve is shown in Figure 4~
Seating surace 30' has a flat portion 32' adjacen~ the openins 3~' and -3 li. or raised portion 33' beyona surface 3~'. ~lv~
m~mber 34' has a lip ~1' and a flat surface or flanga 40' beyond the lip adjacent the outer periphery. Portion 4~' flexes or bends away to allo~ proper seating all around be~een lip 33 and the flange to provide two concentric sealing sur~aces between lip 41 :. and surface 3Z' and lip 33' and surface 40' when valve mem~er 35 is moved upward by s~at 22' in a manner a~ previously descr Oed .
.
; .
.
.
~` ~L0889~
in conneetion with the valve of Figure 1. The flexing or bending of flange 40' when engaged by lip 33' tends to wipe the surface of flange 40' to insure an adequate seal all around the periphery of said valve seating member.
AN IMPROVED GAS VALV~ SEATING MEMBER
~ACKGROUND AND'SUMMARY 0:~ THE INVENTION
While the design of gas valves has always had the concern of disastrous condi.tions ta:king place iE leakage occurs, with the advent of extreme product liability and a greater .
concern for personal sa~ety, there ;`s a continuous endeavour to make gas valves so that when the safety portion of the gas valve closes, gas flo~ is absolutely terminated. As gas valves of this type generally set fox a number of years in an open a posi,tion, especiall~ if the pilot burner is maintained on throughout the summer, a design for a gas valve to insure that there is an ade~uate seal should the safet~ valve close at any ', time ~s a necessity.
The present invention is concerned w.ith a dual sealing ::~
surface valve to insure adequate termination of gas flow without the expense of two series connected ~as Yalves fox redundant .
safety. $peci~ically, the valYe seatiny surface and the valve member engage to ~o~m two concentric seali,ng rin~s or surfaces ~y having a-valve.s:eating surface that has a flat portion and a raised portion concentric of the'opening and a flexible valve member which'h.~s a flat surface and a raised portion on its outer " , periph.ery. ~hen the ~lexi,ble valve me~ber engages the seating surface~ th.e'raised portiPns engage the' xespectiVe flat portions to form the't~ concentric series sealing surfaces to prevent gas flo~ t~roug~`the passage~a~.
In accordance ~ith one aspect of the present invention there is provided a gas valve comprising: a valve body having a passageway through.which, gas is adapted to flow from a source of gas under pressure to a gas burning apparatus; valve means 30. in said pas5ageway comprising: a valve'seating surface having .~ - ~
~ 1- 7~
.
:. ~ . - , . :
10~89~
a flat portion and a raised portion surrounding an opening, and a valve member attached to a shaft for movement against said first seating surface to close the valve, having a second seating surface having a flat portion and a raised portion surrounding said shaft, so that upon said valve member engaging said seating sur~ace, the respective raised portions engage the respective flat portions to form two concentric series seals to prevent gas flow-through said passageway.
In accordance ~ith another aspect of the invention there is provided a gas valve having a valve means in a passageway between an inlet and an outlet comprising: a valve seating surface surrounding an opening in said passageway, said surface having a flat surface around said opening and a concentric raised portion around said surface; a valve member cooperating with said seating surface, said valve member having a flat flange extending outward around the periphery of said valve member, sa~d valve member hawing a ra~.sed portion adjacent sai.d flange intermediate its center and said flange whereby . .
upon s~id valve ~ember engaging said ~alve seating surface; :
2Q said raised portion of s.aid valve member engages said flat surface and said raised portion of sa~.d seati.ng surface engages said flange. to ~orm t~o concentric seals. to stop gas flow through said opening.
In accordance ~ith yet another aspect of the invention there is provided a gas valve. comprising~ a valve body having an i.nlet opening adapted to be connected to a source of gas under pressure, an outlet opening adapted to be connected to a gas burn~ng apparatus, and a passage~ay through the body interconnecting said inlet opening and said outlet 3a opening; a valve seati.ng surface around an opening forming said ~3 89~1 passageway between said inlet opening and said outlet opening, said valve seating surface having a ~lat portion around a periphery o~ said opening with a first lip in close proximity to said flat portion, said lip surrounding said opening and projecting in a first direction parallel to a center of said opening; and a flexible valve member attach.ed to a shaft for movement of said valve member, said valve member having a second lip around its periphery, said second li.p o~ said valve member projecting oppoa~te said first direction; fiaid valve member '' having a flat surface intermediate said second lip and said ', shaft wherehy upon said val~e member engaging said valve seating surface, said first lip of said valve seating surface engages :
said flat surface of sa~d ~alve member and said second lip of said valve. member engages s-aid valve seati.ng surface adjacent its projecting lip ~hen clo~ing,so that two series gas flow aeals are prov~,ded ~hen said va].ve member is moved against said valve seating surface~
The èmbodiments of the invention are shown in the -' drawings as:
2Q Figure 1 i.s a cross sectional view of a valve with the '~ ,, seating surface and valve member in a clos~d position, Figure 2 is a vertical view-of the aeat and valve member, Figure 3 is a side cross sectional view of the valve, -lb-.
10889~
Figure 4 is a second embodiment of the valve.
DESCRIPTIO~ OF T~IE I~VE~TIO~
Referring to Figure 1, a gas valve has a body 10 having an inlet opening 11 for connecting the gas valve to a source of gas under pressure and an outlet opening 12 for connecting the gas valve to a gas burning apparatus such as a furnace. The gas valve has a safety valve 13 and an automatic control portion 14.
The automatic control portion has a valve member 15 controlled by a flexible diaphragm 16 to maintain an adequate flow of gas from the outlet by a pressure regulator or awtomatic control means (not shown) such as disclosed in the Paul Dietiker et al U.S.
patent 3,354,901 issued November 28, 1967. When the sa~ety valve 13 is open, gas flows through a manually operated plug valve 17, a solenoid operated valve 18, the automatic control valve 15 to the outlet. Plug valve 17 is operated by turning a knob 19.
Safety valve 13 has an electromagnet 20 which is con-nected at 21 to a thermocouple. Upon energization of the electro-magnet by heating the thermocouple, an armature attached to shaft 22 and moved against a magnet by the downward manual operation of reset button or knob 19, holds the sa~ety valve in an open position to allow gas flow through the passageway. Such a ther-mocouple operated safety valve is quite conventional and is dis~
closed in the Paul Dietiker U.S. patent 3,877,475 issued April 15, 1975.
As also shown in Figures 2 and 3, safety valve 13 has a valve seating surface 30 which surrounds an opening 31 in the passageway between the inlet and outlet. The seating surface 30 has a flat portion 32 around the opening and a concentric raised portion or lip 33 in close proximity to the flat portion 32 around the periphery of the opening.
108B9~l A valve member 34 which is attached in a conventional mar~er to shaft 22/ cooperates with seating surface 30. valve member 34 has a flexible portion or member 35 made of rubber or suitable flexible material which has a concentric flat portion 40 and a concentric raised portion or lip gl about its periph~ry_ The flexible me~ber or rubber disc 35 is held on shaft 22 and bac'~ed by ~ember ~3. A space 44 is provided between the meta~
disc 43 and the flexible valve m~mber 40 by an indent or groove 45 in the valve member 35 to allow for adjustment of the positiQ~
of the flat portion of the valve member 40 when engaging raisea portion 33 o~ the seating surface to insure a seal all aroun~
raised pox~ion 33.
When valve member 34 moves upward by the force o~ a compression spring 36 to close the safety valve 13 upon k~
-15 de-energization of electromagnet 20, the raised portion 41 engages the surface 32 and the raised portion 33 engages the flexible surface 40 which will bend to accomodate for variations in the tolerance and irregularities or the possibility of foreign par-ticles existing on thP sealing surfaces. With the closure o~
the valve member 34, two concentric rings of sealing sur~ace are providea to provide a two series sealing of the safe~y val~e 13.
Another embodiment of the valve is shown in Figure 4~
Seating surace 30' has a flat portion 32' adjacen~ the openins 3~' and -3 li. or raised portion 33' beyona surface 3~'. ~lv~
m~mber 34' has a lip ~1' and a flat surface or flanga 40' beyond the lip adjacent the outer periphery. Portion 4~' flexes or bends away to allo~ proper seating all around be~een lip 33 and the flange to provide two concentric sealing sur~aces between lip 41 :. and surface 3Z' and lip 33' and surface 40' when valve mem~er 35 is moved upward by s~at 22' in a manner a~ previously descr Oed .
.
; .
.
.
~` ~L0889~
in conneetion with the valve of Figure 1. The flexing or bending of flange 40' when engaged by lip 33' tends to wipe the surface of flange 40' to insure an adequate seal all around the periphery of said valve seating member.
Claims (7)
1. A gas valve comprising a valve body having an inlet opening adapted to be con-nected to a source of gas under pressure, an outlet opening adapted to be connected to a gas burning apparatus, and a passage-way through the body interconnecting said inlet opening and said outlet opening, a valve seating surface around an opening forming said passageway between said inlet opening and said outlet opening, said valve seating surface having a flat portion around a periphery of said opening with a first lip in close proximity to said flat portion, said lip surrounding said opening and projecting in a first direction parallel to a center of said opening, and a flexible valve member attached to a shaft for move-ment of said valve member, said valve member having a second lip around its periphery, said second lip of said valve member pro-jecting opposite said first direction, said valve member having a flat surface intermediate said second lip and said shaft whereby upon said valve member engaging said valve seating surface, said first lip of said valve seating surface engages said flat surface of said valve member and said second lip of said valve member engages said valve seating surface adjacent its projecting lip when closing so that two series gas flow seals are provided when said valve member is moved against said valve seating surface.
2. The invention of claim 1 wherein said flexible valve member has a rigid backing member and a space between the back side of the flat surface of said flexible valve member and said rigid backing member to allow for
2. The invention of claim 1 wherein said flexible valve member has a rigid backing member and a space between the back side of the flat surface of said flexible valve member and said rigid backing member to allow for
Claim 2 continued movement of the flat surface of said valve member when engaged by said first lip of said valve seating surface upon closure of said valve member to provide a seal between said first lip of said seating surface and said valve member all around the surface of said first lip.
3. The invention of claim 2 wherein said flexible valve member has inlet gas pressure on its back side to force said second lip against said flat portion of said valve seating surface and said flexible flat surface of said valve member against said first lip to provide said two series seals against gas flow through said passageway.
4. A gas valve comprising, a valve body having a passageway through which gas is adapted to flow from a source of gas under pressure to a gas burning apparatus, valve means in said passageway comprising;
a valve seating surface having a flat portion and a raised portion surrounding an opening, and a valve member attached to a shaft for movement against said first seating surface to close the valve, having a second seating surface having a flat portion and a raised portion sur-rounding said shaft, so that upon said valve member engaging said seating surface, the respective raised portions engage the respec-tive flat portions to form two concentric series seals to prevent gas flow through said passageway.
a valve seating surface having a flat portion and a raised portion surrounding an opening, and a valve member attached to a shaft for movement against said first seating surface to close the valve, having a second seating surface having a flat portion and a raised portion sur-rounding said shaft, so that upon said valve member engaging said seating surface, the respective raised portions engage the respec-tive flat portions to form two concentric series seals to prevent gas flow through said passageway.
5. The invention of claim 4 wherein one of said flat portions is flexible to insure a seal between the raised portion engaging it when the valve member is moved to close the valve.
6. A gas valve having a valve means in a passageway between an inlet and an outlet comprising, a valve seating surface surrounding an opening in said passageway, said surface having a flat surface around said opening and a concentric raised portion around said surface, a valve member cooperating with said seating surface, said valve member having a flat flange extending outward around the periphery of said valve member, said valve member having a raised portion adjacent said flange intermediate its center and said flange whereby upon said valve member engaging said valve seating surface, said raised portion of said valve member engages said flat surface and said raised portion of said seating surface engages said flange to form two concentric seals to stop gas flow through said opening.
7. The invention of claim 6 wherein said raised portion of said seating surface is higher than said raised portion of said valve member so that upon said valve member moving against said seating surface and said raised portion contacting said flange, said flange bends away from said raised portion of said seating surface to provide contact around the complete surface of said raised portion to insure a seal all around between said raised portion of said seating surface and said flange.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US822,978 | 1977-08-08 | ||
| US05/822,978 US4188013A (en) | 1977-08-08 | 1977-08-08 | Gas valve seating member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1088911A true CA1088911A (en) | 1980-11-04 |
Family
ID=25237460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA307,807A Expired CA1088911A (en) | 1977-08-08 | 1978-07-20 | Gas valve seating member |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4188013A (en) |
| CA (1) | CA1088911A (en) |
| DE (1) | DE2834219A1 (en) |
| FR (1) | FR2400152A1 (en) |
| GB (1) | GB2002090B (en) |
| IT (1) | IT1105516B (en) |
| NL (1) | NL7808094A (en) |
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| US2403777A (en) * | 1943-04-16 | 1946-07-09 | Adolph J Yanka | Valve for controlling distribution of fluids |
| US2387653A (en) * | 1943-08-05 | 1945-10-23 | Velvac Inc | Control valve |
| US2429984A (en) * | 1944-08-23 | 1947-11-04 | American Can Co | Valve closed container |
| US2413571A (en) * | 1945-09-11 | 1946-12-31 | Wheaton Brass Works | Self-sealing valved coupling |
| US2731036A (en) * | 1951-10-06 | 1956-01-17 | Reynolds Gas Regulator Company | Valve seat structure |
| US2902249A (en) * | 1953-07-27 | 1959-09-01 | Baso Inc | Valve |
| US2880750A (en) * | 1954-04-01 | 1959-04-07 | Bendix Aviat Corp | Valve |
| US2979643A (en) * | 1957-05-29 | 1961-04-11 | Gen Motors Corp | Solenoid valve assembly |
| US3409039A (en) * | 1963-04-22 | 1968-11-05 | Murphy Ind Inc G W | Valve member having conically tapered seating surface |
| US3354901A (en) * | 1965-05-18 | 1967-11-28 | Honeywell Inc | Control apparatus |
| US3398890A (en) * | 1966-10-03 | 1968-08-27 | Aurora Corp | Fail-safe regulator for gas-oven burners |
| US3722852A (en) * | 1969-03-20 | 1973-03-27 | Anderson Greenwood & Co | Relief valve |
| US3575197A (en) * | 1969-06-27 | 1971-04-20 | Itt | Valve leak detector |
| DE2120082A1 (en) * | 1971-04-24 | 1972-11-09 | Leybold-Heraeus GmbH & Co KG, 5000 Köln | Sealing washer for all-metal valves |
| US3877475A (en) * | 1973-10-17 | 1975-04-15 | Honeywell Inc | Safe lighting gas valve |
-
1977
- 1977-08-08 US US05/822,978 patent/US4188013A/en not_active Expired - Lifetime
-
1978
- 1978-07-05 GB GB7828838A patent/GB2002090B/en not_active Expired
- 1978-07-20 CA CA307,807A patent/CA1088911A/en not_active Expired
- 1978-08-01 NL NL787808094A patent/NL7808094A/en not_active Application Discontinuation
- 1978-08-04 DE DE19782834219 patent/DE2834219A1/en not_active Withdrawn
- 1978-08-04 FR FR7823189A patent/FR2400152A1/en not_active Withdrawn
- 1978-08-07 IT IT50624/78A patent/IT1105516B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT7850624A0 (en) | 1978-08-07 |
| US4188013A (en) | 1980-02-12 |
| NL7808094A (en) | 1979-02-12 |
| GB2002090B (en) | 1982-01-06 |
| IT1105516B (en) | 1985-11-04 |
| FR2400152A1 (en) | 1979-03-09 |
| DE2834219A1 (en) | 1979-02-22 |
| GB2002090A (en) | 1979-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |